Condenser



Oct. '15, 1929.

E. D. EBY

CONDENSER Filed Sept. 2, 1927 7 .;W W W n m em W v.9 A Tm U5 5 E m I w withinwhich casing and bushing oil or any' provided suitable manner,

Patented Oct. 15, 1929 EUGENE D. EIBY, OF PITTSFIELD, MASSACHUSETTS, ASSIGNOR TO NT OFFICE COMPANY, A CORPORATION OF N EW YORK CONDENSER Application filed September 2, 1927. Serial no. 217,252.

My invention relates to condensers. More particularly it relates to condensers of the type which are especially adapted for use in connection with carrier currents and the like.

One of the objects of my invention is to provide a condenser in the form of a cable loop with a form of terminal especially adapted for a condenser ofthis type. -A further object is to provide a condenser of the foregoing character which is comparatively inexpensive, the construction of which is simple and reliable, and the capacity of which can be readily varied by changing the length of the cable.

The invention will be more readily understood from the following specification and claims. 3

Referring to the drawing, Fig. 1 shows one form of condenser involving my invention,

in elevation; Fig. 2 shows the upper portion of the condenser in section.

v Referring more in detail to the drawing, it

will be seen thatthe condenser comprises a cable section 2 folded in the form of a loop,

' the ends of which cable are provided with a terminal arrangement comprising a hollow petticoat bushing 3 and a hollow casing 4,

other suitable insulating fluid is contained. As shown, the top of the bushing is provided with a cap element 5 within which there is an expansible reservoir 5? in the form of a sylphon element. Secured to the casing 4 and to the lower portionof the bushing' 3 there is provided a framework 6 for holding the lower portion of the cable 2 1n position, thereby preventing the cable from flexing from side to ,side. This framework is made up preferably of angle iron, the support eing arranged on both sides of cable 2. The two sections of the angle frame structure may be drawn together and held together 1n any as for example, by means of bolts which may be applied to the lower portion of the structure at any point or points desired. For example, the structure may be drawn together by means of-a bolt at the point of intersection 7 Referring to Fig. 2, it will be seen that the cable in the particular form shown is hollow. The inner conductor 8 is provided with a duct 9 which extends all the way through the cable. This inner conductor is provided with the usual form of insulation 10 and may be formed, for example, of a hollow cable of woven wire strands. The cable is provided with the usual lead sheath 11 which forms the outer plate of the conenser. As illustrated in the drawing, the terminals of the inner conductor 8 are electrically connected to the head 12 of a bolt, the stem 13 of which is threaded as indicated. The bolt is supported by a cap element 14, whlch element is seated on the upper end of the petticoat insulator 8. The upper end of the insulator is provided with a metal collar 16 which is suitably secured to the insulator, as for example, by means of cement or the like. As indicated, the cap 14 is bolted in position to the collar 16. It will be seen further that the bolt 13 is provided with nuts 17 which serve to prevent the threaded section 13 of. the bolt which supports the cable from falling through. The threaded portion of the bolt 13 passes through a plate 18, which latter is secured to the cap 14 by means of screws 19. As indicated, the cap 14 is provided with ducts 20 for the purpose of providing passage for the oil. The cap 14 is provided with a head plate 21 which, as indicated, is screwed to the cap 14 by means of the screws 22. The plate 21 is provided with a threaded opening for receiving a threaded pipe 23 to the upper end of which is screwed the sylphon element 5*. It will be understood that between the cap 14 and the bushing 3, and also between the plate 21 and the cap 14, suitable gaskets are provided in order to make oil-tight joints. As will be seen from the drawing (Fig. 2), the base of the porcelain bushing 3 rests upon a metal plate 24. There is also provided a metal collar 25 around the lower end of the bus.;\- ing, which collar is suitably secured to the bushing, as for example, by means of cement. As indicated, the plate 24 is secured to the collar 25, and therefore the bushing 3 by means of bolts 26. Between the plate 24 and the bushing 3rthere to insure an oil-tight connection between the is provided a gasket 27 the casing 4 is provided with an insulating v ring or flange 28 which rests within a circular recess about the inner rim of the plate 24.

The Casing 4 is provided with an extension 29 which is seated inturn on top of the flange 28. As will be seen, both of the flanges, that is, the flange of the casing 4 and the flange of the extension 29, are clamped in position between the gasket, the heel of the bushing 3 and the plate 24, thus insuring an oil-tight connection between the casing, the plate 24, and the bushing 3. It will be seen that the lower end of the casing 4 is covered by a construction consisting of plates 30 and 31, which are provided with downwardly extending tubular extensions 32 and 33, respectively. These plates are secured to each other by means of bolts 34 and fastened to the lower end of the casing by bolts 35, the connection being such as to insure oil-tight connections. Between the tubular extensions 32 and the sheath 11 of the cable 2, the connection is sealed by means of a lead joint 36. Similarly, by means of a lead joint 37, the other extension 33 is connected with the other terminal of the lead sheath 11, thus insuring oil-tight joints between the ends of the sheath 11 and the extensions 32 and 33. It will be seen that the extension 32 is provided with a threaded plug 38 and the extension 33 is provided with a threaded plug 39. Also it will be seen that the top of the syl phon element 5 is'provided with a threaded plug 40. The casing 5, which rests on the cap 14 at the top of the bushing 3, serves as a shield for the sylphon element 5 and also serves as a terminal for the inner conducting element of the condenser, a suitable flange 41 being provided to which electrical connec- .tions may be secured. The casing 5, as will be seen, is securely bolted to the cap element 14, thus insuring electrical connection with the inner conductor 8 of the cable. The connection ,With the sheath element 11, which serves as the outer element of the condenser, may of course be made in any suitable manner; as for example, with a clamp.

As indicated in Fig. 2, the structural iron work 6 is secured to the plate 24 at the bottom of the bushing 3 by any suitable means,

such for example, as the bolts 43.

After the condenser has been assembled it is tilled with a suitable insulating fluid such as oil or carbon tetrachloride, as for example, through the sylphon element 5. By removing the plug 40 the oil of course passes through the sylphon element '5 and down through the pipe 23 into the chamber below in which is located the threaded element 13, thence the oil passes through the ducts 20 to within the bushing element 3. Inasmuch as there is a spacing between the rim of the plate 18 and the inner walls of the bushing, the oil passes down the space between the cable and the walls of the bushing. tween the extension 29 of the casing 4 and the casing 4 and the cable to the region below the flange 28 to within the casing 4 reaching down as far as the joints 36 and 37 and, in fact, permeating the whole cable, the insulating material, such as paper and the like, being all ermeated with the oil. When the condenser is filled with oil, variations in temperature will of course cause contraction and expansion, and therefore the head of the oil will rise and fall. It is the function of the sylphon element 5 to allow for this expansion and contraction. It will be seen that a window 43 is provided in the casing 5. Through this window, the sylphon element 5 may be seen and the condition of the oil with respect to contraction and expansion or leakage can be readily determined.

Within the condenser, I have provided tubular metal shields 29 and 45, the function of these shields being to properly distribute the electrostatic stresses to insure against overstraining in the region about them, as is well understood. I have provided an insulation barrier 44.

It will be seen, therefore, that I provide a condenser of very simple construction and comparatively inexpensive. I provide a type of construction such that the capacity of the condenser is readily changed by changing the length of the cable. I provide a construction for a condenser of this type Which insures effective insulation by bringing the ends of the cable to an oil container as a terminal.

It will be understood that the container or bushing shown in Fig. 2 may be considered as extending from the top terminal of the de-- vice of Fig. 2 all the way down to the sheath 11. I wish to also call attention to the following provision. Immediately beneath the tubular extensions 32 and 33, and extending as far down as the sheath 11 beneath the joint 36, that is, between the reinforcing insulation around the cable 10 and the elements 45, 32 and 33 at the point where the widening sleeve is formed, I provide a covering over the reinforcing insulation of a metal, such as copper, in the form for example of a flexible braid, for the purpose of extending the sheath potential to the point of maximum diameter of the reinforcing insulation. in order to relieve the strain due to the dielectric stresses in this region.

I also wish to call attention to the fact that the expansible member 5 may be connected to the condenser at any other suitable point, as for example, at the point represented by one of the plugs 38 or 39. I also contemplate that the plugs 38 or 39 may be replaced by a valve such as an alemite valve used in connection wit-l1 the lubrication of automobiles and thereby facilitating the introductionv or below the plate 18 filling in all I The oil then passes down bealso be seen that at v and the removal ofoil into the condenser. It will the point where the two branches of the cable separate just above the element 45 a porcelain separator is inserted for the purpose of fixing the location of the cables with respect to each other.

It will be understood that while I have describedmy invention in connection with a specific form of construction, I do not wish to be so limited inasmuch as my invention is of considerable scope as indicated by the claims contained herein, which of course cover other modifications readily suggested in view of the disclosure.

What I claim as new and desire to secure by Letters Patent of the United States, is:

1. A condenser including a hollow bushing of insulation, a cable having a metal sheath and a metal core, the latter being incased in a covering of insulation whereby the sheath core are maintained insulated from each other, said cable being looped with the core thereof forming a closed loop, said sheath extending only over a portion of the loop, that portion of the loop located outside the ends of the sheath being inserted through one end of the bushing, said sheath forming one terminal of the condenser, and a second terminal for the condenser connect d to the core, said second terminal sealed to the bushing at one end thereof, the ends of the sheath being sealed to the other end of the bushing.

2. A condenser including a hollow bushing of insulation, a cable having a metal sheath and a metal core, the latter being incased in a covering of insulation whereby the sheath and the core are maintained insulated from each other, said cable being looped with the core thereof forming a closed loop, said sheath extending only over a portion of the loop, that portion of the loop located outside the ends ofthe sheath being inserted through one end of the bushing, said sheath forming one terminal of the condenser, a second terminal for the condenser connected to the core, said second terminal being secured and sealed to being secured and the core of the cable being connected to said terminal within said bushing, and said sheath forming the other terminal of the condenser.

4. A condenser including a cable having a core and a sheath suitably insulated from each other, the core forming a closed loop and the sheath forming an open loop, the end portions of the core being outside the sheath, a hollow bushing, the uncovered portions of the core being inserted into the bushing at one end thereof, both ends of the sheath being sealed to the same end of the bushing, and a terminal for the condenser secured to the other end of the bushing and sealed thereto, the core of the cable being connected to said terminal within said bushing, said sheath forming the other terminal of the condenser, said bushing and said cable forming a sealed container, an insulating oil in said container, and a sylphon connected to said container whereby the oil may freely expand and contract under the sealed condition.

In witness whereof, I have hereunto set my hand this 31st day of August, 1927.

EUGENE D. EBY.

the bushing at one end thereof, the ends of the sheath being sealed to the other end of-the bushing, thereby forming a sealed container, said container being filled with an insulating fluid, and a sylphon connected to the sealed container whereby the fluid may readily contractand expand under the sealed condition.

3. A condenser including a cable having a core and a sheath suitably insulated from each other, the core forming a closed loop and the sheath forming an open loop, the end portions of the core being outside the sheath,

a hollow bushing, the uncovered" portions of the core being inserted into the bushing at one end thereof, both ends of the sheath being sealed to the same end of the bushing, and a terminal for the condenser secured to' the other end of the bushing and sealed thereto, 

